Mechanical and Durability Testing - Polymer Testing - Engineering Sciences Previous Year Questions

1

2008 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2008

The notched Izod impact strength of acrylonitrile-butadiene-styrene polymer(ABS), polypropylene (PP), polycarbonate (PC) and phenol-formaldehyde (PF) resin follows the order

A

PC < ABS < PP < PF

B

ABS < PF < PC < PP

C

PF < PC < ABS < PF

D

PF < PP < ABS < PC

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2

2012 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2012

If a solid elastomer ball of weight 100 g is allowed to free fall from a height of 10 m and it rebounds back to a height of 8 m, the hysteresis loss is

A

19.60 J

B

9.80 J

C

1.96 J

D

0.98 J

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3

2014 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2014

The dynamic mechanical response of a thermoplastic automotive component has shown a loss angle of 45° and storage modulus of 3500 MPa. Calculate the loss modulus (MPa) of the component.

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4

2015 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2015

Notched impact strength of a plastic decreases with

A

increase in notch tip radius

B

increase in notch depth

C

increase in temperature

D

decrease in notch depth

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5

2015 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2015

The damping factor of a solid polymer under sinusoidal loading in single cantilever mode showing 80 percent recovery in modulus is ______.

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6

2018 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2018

Storage modulus and tan δ of a polymer are experimentally measured by

A

Differential scanning calorimetry

B

Thermogravimetric analysis

C

Thermomechanical analysis

D

Dynamic mechanical thermal analysis

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7

2019 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2019

A stress of 17 MPa is applied to a polymer serving as a fastener in a complex assembly. At constant strain the stress drops to 16.6 MPa after 100 hours. The stress on the polymer must remain above 14.5 MPa in order for the assembly to function properly. The expected life of the assembly is ______ hours. (round off to the nearest integer)

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8

2020 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2020

The change in stress of a polymer as a function of time at a fixed strain is known as

A

Fatigue

B

Creep

C

Stress relaxation

D

Fracture toughness

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9

2022 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2022

In a rubber sample with a Mooney viscosity of 60 ML(1+4) 100 °C, the number 4 signifies

A

Applied shear rate in s⁻¹

B

Number of samples tested

C

Time in minutes after starting the motor when the measurement is taken

D

Preheating time in minutes

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10

2022 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2022

Toughness in a polymer can be inferred from

A

Izod impact strength

B

Depth of indentation

C

Area under the stress-strain curve

D

Charpy impact strength

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11

2024 · Engineering Sciences · Polymer Testing · Mechanical and Durability Testing

Engineering Sciences (XE) 2024

Match the following properties with their respective units.

Property	Unit
P. Notched Izod impact strength	1. Pa s
Q. Flexural strength	2. J m-1
R. Dielectric strength	3. MPa
S. Complex viscosity	4. kV cm-1

A

P-1; Q-2; R-3; S-4

B

P-2; Q-1; R-3; S-4

C

P-2; Q-3; R-4; S-1

D

P-3; Q-1; R-2; S-4

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